83.21.9 problem 9

Internal problem ID [19253]
Book : A Text book for differentional equations for postgraduate students by Ray and Chaturvedi. First edition, 1958. BHASKAR press. INDIA
Section : Chapter IV. Equations of the first order but not of the first degree. Exercise IV (D) at page 57
Problem number : 9
Date solved : Tuesday, January 28, 2025 at 01:15:43 PM
CAS classification : [[_1st_order, _with_linear_symmetries], _Clairaut]

\begin{align*} y&=x y^{\prime }+{y^{\prime }}^{3} \end{align*}

✓ Solution by Maple

Time used: 0.045 (sec). Leaf size: 37

dsolve(y(x)=x*diff(y(x),x)+diff(y(x),x)^3,y(x), singsol=all)
 

\begin{align*} y \left (x \right ) &= \frac {2 \sqrt {3}\, \left (-x \right )^{{3}/{2}}}{9} \\ y \left (x \right ) &= -\frac {2 \sqrt {3}\, \left (-x \right )^{{3}/{2}}}{9} \\ y \left (x \right ) &= c_{1} \left (c_{1}^{2}+x \right ) \\ \end{align*}

✓ Solution by Mathematica

Time used: 0.006 (sec). Leaf size: 54

DSolve[y[x]==x*D[y[x],x]+D[y[x],x]^3,y[x],x,IncludeSingularSolutions -> True]
 

\begin{align*} y(x)\to c_1 \left (x+c_1{}^2\right ) \\ y(x)\to -\frac {2 i x^{3/2}}{3 \sqrt {3}} \\ y(x)\to \frac {2 i x^{3/2}}{3 \sqrt {3}} \\ \end{align*}